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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2019

Magnetoelastic and magnetoelectric couplings across the antiferromagnetic transition in multiferroic BiFeO 3

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Résumé

Clear anomalies in the lattice thermal expansion (deviation from linear variation) and elastic properties (soft-ening of the sound velocity) at the antiferromagnetic-to-paramagnetic transition are observed in the prototypical multiferroic BiFeO 3 using a combination of picosecond acoustic pump-probe and high-temperature x-ray-diffraction experiments. Similar anomalies are also evidenced using second-principles calculations supporting our experimental findings. Those calculations, in addition to a simple Landau-like model we also developed, allow us to understand the elastic softening and lattice change at T N as a result of magnetostriction combined with electrostrictive and magnetoelectric couplings, which renormalize the elastic constants of the high-temperature reference phase when the critical T N temperature is reached.
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Dates et versions

hal-02108984 , version 1 (21-09-2020)

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Mariusz Lejman, Charles Paillard, Vincent Juvé, Gwenäelle G. Vaudel, Nicolas Guiblin, et al.. Magnetoelastic and magnetoelectric couplings across the antiferromagnetic transition in multiferroic BiFeO 3. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2019, 99 (10), ⟨10.1103/PhysRevB.99.104103⟩. ⟨hal-02108984⟩
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